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Subject: Re: If you like to solve one easy mate...

Author: leonid

Date: 13:43:21 02/16/01

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On February 16, 2001 at 11:42:31, Heiner Marxen wrote:

>On February 16, 2001 at 08:18:38, Uri Blass wrote:
>
>>On February 16, 2001 at 06:42:19, leonid wrote:
>>
>>>Hi!
>>>
>>>If you like to relax by solving short and easy mate then this is just for you:
>>
>>>
>>>[D]1qNqkqNq/1r1nbn1r/1QQ1q1QQ/1qn1Q1nq/BQ2b2B/3Q1Q2/4Q3/3RKR2 w - -
>>>
>>>Please, indicate your result.
>>
>>
>>I tried to solve it for a 3 minutes without success .
>>
>>You ask if you like to relax by solving short and easy mate so I assume that it
>>was meant for humans because I do not see how humans can relax from the fact
>>that a chess program can solve it.
>>
>>
>>Junior5.9 found that Qxf8+ is a mate in 7
>>
>>I used Junior to generate a proof for it and her is the proof
>>
>>1.Qxf8+ Kxf8[Bxf8 2.Qcxe6+ Ncxe6(2...Qe7 or 2...Be7 3.Qxe7+ and 4.Qxe7#) and
>>after 2...Ngxe6 3.Qxd8#) 3.Qxf8+ Kxf8(Ndxf8 4.Qdxd8#) 4.Qxd8+ Nexd8
>>5.Qe7#]2.Qxd8+ Bxd8 3.Qbxc5+ Qxc5 4.Qcxc5+ Qed6 5.Qcxd6+ Qxd6(5...Be7 6.Qdxe7#)
>>6.Qdxd6+ Be7 7.Qexe7#
>>
>>Possible alternatives for black:
>>
>>Alternatives at move 3:
>>3...Ke8 4.Qcxe6+ Nxe6(or Be7 5.Qexe7#) 5.Qexe6+ Be7 6.Qcxe7#
>>3...Qed6 4.Qc6xd6+ Qxd6(or Be7 5.Qdxe7#) 5.Qcxd6+ Be7 6.Qexe7#
>>3...Qbd6 4.Q6xd6+ and now
>>a)Qxd6 5.Qcxd6+ Be7 Qexe7#
>>b)Be7 5.Qxe7+ Qxe7 6.Qexe7#
>>c)Ke8 5.Qf8+ Nxf8 6.Qxd8#
>>d)Qe7 5.Qdxe7+ Bxe7 6.Qexe7#
>>3...Qe7 4.Qexe7+ Bxe7 5.Qxe7#
>>3...Nc5 4.Qxd8+ Qe8 5.Qexe8#
>>3...Be7 4.Qxe7+ Qxe7 5.Qxe7#
>>
>>Alternatives at move 4:
>>
>>4...Qbd6 5.Qdxd6+ and now
>>
>>a)5...Qxd6 6.Qcxd6+ Be7 7.Qdxe7#
>>b)5...Be7 6.Qxe7+ Qxe7 7.Qcxe7#
>>c)5...Qe7 6.Qdxe7+ Bxe7 7.Qcxe7#
>>d)5...Ke8 6.Qf8#
>>
>>4...Ke8 5.Qxd7+ Rxd7 6.Bxd7#
>>4...Nxc5 5.Qxd8+ Qe8 6.Qexe8#
>>4...Qe7 5.Qcxe7+ Bxe7 6.Qxe7#
>>4...Be7 5.Qxe7+ Qxe7 6.Qxe7#
>
>Perfect!  Chest confirms all this (I checked it manually).
>(less than 2 minutes on K7/600)

Excellent, time, Heiner!

>>I think the mate in 50 that somebody else posted is clearly more easy for me.
>>Only writing the solution of this mate took me more than 10 minutes and I am not
>>sure that there are no mistakes(I was too lazy to check it).
>>
>>Uri
>
>I agree.  While Leonid's problems are great stuff for my program, they
>are not much fun for myself, they are just too complicated for me.
>I suspect it is more fun to compose them ;-)

Agree!

Cheers!
Leonid.


>Heiner



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